c# form problem with user

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C#

Hello! First Sorry for my bad English. I have three classes and I need to save my var userId in my form . First Class is:

private void buttonOk_Click(object sender, EventArgs e)
       {


           UserEntity user = new UserEntity(textBoxUsername.Text,textBoxPassword.Text);
           if (user.getUser()) {


               MainPanel mp = new MainPanel();
               mp.User = user;
               mp.Show();

           }

When the button is clicked we go to Second class:

private void ProfitPanelButton_Click(object sender, EventArgs e)
       {

           UserEntity user = new UserEntity();
           if (user.getUser())
           {

               ProfitPanel pp = new ProfitPanel();
               pp.User = user;
               pp.Show();

           }
           else
           {
               MessageBox.Show("ERROR");
           }


       }

When We clicked ProfitPanelButton go to profit and insert Profit into DB .


I don't have any problem with going from 1st button directly to 3rd with code :

private void buttonOk_Click(object sender, EventArgs e)
    {


        UserEntity user = new UserEntity(textBoxUsername.Text,textBoxPassword.Text);
        if (user.getUser()) {

            ProfitPanel pp = new ProfitPanel();
            pp.User = user;
            pp.Show();


     }

    }

Can you help me to fix this problem or give me some idea. Thanks.